DTWflyer

Question for those in the know.

As many road warriors know, sometimes leisure & business travel can conflict...anyways.

I booked a res. many weeks ago to go DTW-LAS r/t for next weekend.
Now I found out I have to go down to ROA for a few days this week.

So, I booked a DTW-ROA r/t that gets me back into DTW in time to connect to the outbound segment of my DTW-LAS r/t.

Since I have a 50 min connection in DTW, I need to check a bag in ROA to LAS, but it is on different res. #'s.

Is this easy to accomplish? Is there some feature to link the reservations?

Thanks in advance.